Evaluating Holistic Environmental Consequences of Brownfield Management Options Using Consequential Life Cycle Assessment for Different Perspectives |
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Authors: | Pascal Lesage Louise Deschênes Réjean Samson |
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Institution: | (1) Chemical Engineering Department, CIRAIG Interuniversity Reference Center for the Life Cycle Assessment, Interpretation and Management of Products, Processes and Services, école Polytechnique de Montréal, P.O. Box 6079, Stn. Centre-Ville, H3T 1J4 Montréal, Québec, Canada |
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Abstract: | Brownfields are abandoned, idled, or underused sites whose reuse necessitates some sort of intervention. These sites are largely
urban and are frequently contaminated. Brownfield management options can be associated with three types of environmental consequences:
those resulting from changes in the site’s environmental quality (primary impacts); those resulting from the actual intervention
stage (secondary impacts); and, if the vocation of the site changes, those resulting from effects on regional land use (tertiary
impacts). Different stakeholders and decision-making contexts will place a different importance on each of these types of
impacts. This article proposes a framework for comparing brownfield management options in regard to these three types of environmental
impacts and for interpreting these results from different perspectives. The assessment framework is based on consequential
life cycle assessment (LCA), which is shown to provide environmental information on the three types of impacts. The results
for a case study are presented, where a “rehabilitation” option allowing residential redevelopment is compared to an “exposure
minimization” option not resulting in the site being reused. Calculated primary and tertiary impacts are favorable to the
rehabilitation option, whereas secondary impacts are favorable to the exposure minimization option. A ternary diagram presents
the favorable option for different stereotypical perspectives. Tertiary impacts are much greater than secondary impacts, and
consequently all perspectives that consider tertiary impacts favor rehabilitation. The perspective that considers primary
and secondary impacts receives conflicting information. The ternary diagram, showing results for all perspectives, could possibly
be useful for consensus-building among stakeholders. |
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Keywords: | Brownfield management Brownfield rehabilitation Life cycle assessment Consequential life cycle assessment Contaminated site Site remediation |
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